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Kinetic, equilibrium, and thermodynamic studies of heavy metal removal from aqueous solutions by natural material from Morocco

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Abstract

This study deals with the adsorption kinetics, equilibrium, and thermodynamics of the removal of Cr(VI) and Cu(II) ions from an aqueous solution using natural material from Morocco (NMT). The adsorbent used is characterized by different physicochemical techniques such as X-ray fluorescence spectrometry, X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and energy-dispersive X-ray spectroscopy (EDX). The effects of various experimental conditions, including contact time, pH, adsorbent dosage, initial concentration, and temperature, on metal removal by the natural adsorbent were investigated. Under optimal conditions, adsorption efficiencies of 65.21% and 91.31% are respectively observed for Cr(VI) and Cu(II) ions, and the adsorption is explained well by the pseudo-second-order kinetic model. The experimental equilibrium adsorption data were analyzed using the Langmuir, Freundlich, and Dubinin–Radushkevich (D–R) isotherm equations at different concentrations. The Langmuir separation factor RL and the n value for the Freundlich isotherm show that Cr(VI) and Cu(II) ions are adsorbed favorably onto the NMT. Thermodynamic parameters, such as the Gibbs free energy (∆G), the adsorption entropy (∆S), and the adsorption enthalpy (∆H), suggest that the adsorption process is spontaneous, endothermic, and controlled by physical mechanisms for both heavy metals.

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Correspondence to Karim Tanji.

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The authors declare that there is no conflict of interest regarding the publication of this paper.

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Communicated by Aymen Amin Assadi, Associate Editor.

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Ksakas, A., Arrahli, A., Dra, A. et al. Kinetic, equilibrium, and thermodynamic studies of heavy metal removal from aqueous solutions by natural material from Morocco. Euro-Mediterr J Environ Integr 7, 141–153 (2022). https://doi.org/10.1007/s41207-022-00298-3

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  • DOI: https://doi.org/10.1007/s41207-022-00298-3

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